Improvement in pistons and piston-packing



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Letters Patent No. 98,232, datedDecember 28, 1869.

IMPROVEMENT IN PISTONS AND PISTON-PACKING.

The Schedule referred to in these Letters Patent and making Aperi: ofthcfsame.

To all whom it ana/y concern:

Be it known that I, O. COLLIER, of Sacramento, in the county ofSacramento, and State of California, have invented a new and usefulImprovement in Pistons; and I do hereby declare that the following is afull, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming part oifthis specification.

This invention relates to improvements in pistons for steam-enginepumps, Sto., and mode ot' packing the same, having for its objecttoprovide a simple, cheap, and more eicient arrangement` of parts thanthose now in use. l

M y invent-ion consists in a piston provided with two end disks, acentral ring with three annular recesses, two end rings, and anadjustable centring-ring, as more particularly described hereafter.

Figure 1 represents a sectional elevation of 'my im# l proved piston,taken yon the line x w of fig. 2, and

Figure 2 represents a section taken on thel line y y of fig. l.

Similar letters of reference indicate corresponding parts. f

The piston comprises two disks, A andB, anda grooved ring, C.

The disk A isl provided with a central tubularv etension, D, whichreceives the disk B at the end against a shoulder, a. It also receivesinternally the ypiston-rod E, which projects sucientlybeyond the end toreceive a nut, F, for clamping the two disks together, with the grooredring C betweenthem, and

secures the whole on the rod against the collar G.

The ring C and the disks are oi' the same diameter, and the facescoincide.

This ring is provided with three grooves, l), in its face, in the ltwoouter ones ot' which thc spring pack ing-rings H are placed, and in thecentral grooveanother stronger ling I is placed, which seryesfalso as apacking-ring, but more especially designed .for centring the piston bythe use of set-screws K, screwing through the ring C.

Thesel set-screws may set dircctlyvagainst the ring, l

or springs -L may be interposed.

lhis arrangement provides a veryv simple constrnctionand au eicien't andsimple lmeans of centring the piston and keeping it ofi' the surface ofthe cylinder. i

y Witnesses:

THos. C. EDWARDS, Taos. W. GILMER.

'Ibe rings I-I areprovided with transverse grooves f

